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图5 2021年榆中站散射辐射Erbs模型（a）、Orgill模型（b）及Liu模型（c）修正前后MAPE月际变化

Fig.5 Monthly variation of MAPE before and after revise of the diffuse radiation for Erbs (a), Orgill (b) and Liu (c) models at Yuzhong Station in 2021